:root{
  --navy:#2b2b6e;
  --navy-d:#20204f;
  --ink:#1d1d24;
  --muted:#6b6f76;
  --line:#e6e7ec;
  --bg:#ffffff;
  --soft:#f5f6f9;
  --ok:#1f9d57;
  --warn:#b9892b;
  --sale:#d8262d;
  --radius:14px;
  --shadow:0 1px 2px rgba(20,20,40,.04),0 8px 24px rgba(20,20,40,.06);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:"Noto Sans TC","PingFang TC","Microsoft JhengHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  color:var(--ink);
  background:transparent;
  -webkit-font-smoothing:antialiased;
  line-height:1.5;
}
.wf{
  max-width:640px;
  margin:0 auto;
  padding:20px 16px 26px;
}
/* header */
.wf-head{margin-bottom:18px}
.wf-title{
  font-size:22px;font-weight:800;margin:0;letter-spacing:.3px;
  color:var(--navy);display:flex;align-items:center;gap:9px;
}
.wf-title::before{
  content:"";width:22px;height:22px;flex:0 0 auto;border-radius:6px;
  background:var(--navy);
  -webkit-mask:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'><path d='M3 17l6-10c.3-.5.8-.8 1.4-.8h3.2c.6 0 1.1.3 1.4.8l6 10c.5.8-.1 1.9-1.1 1.9H4.1C3.1 18.9 2.5 17.8 3 17z'/></svg>") center/16px no-repeat;
          mask:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'><path d='M3 17l6-10c.3-.5.8-.8 1.4-.8h3.2c.6 0 1.1.3 1.4.8l6 10c.5.8-.1 1.9-1.1 1.9H4.1C3.1 18.9 2.5 17.8 3 17z'/></svg>") center/16px no-repeat;
}
.wf-sub{margin:6px 0 0;color:var(--muted);font-size:13.5px}
/* steps */
.wf-steps{display:flex;flex-direction:column;gap:12px}
.wf-field{display:flex;flex-direction:column;gap:6px}
.wf-label{font-size:13px;font-weight:700;color:var(--ink);display:flex;align-items:center;gap:7px}
.wf-label i{
  font-style:normal;width:19px;height:19px;border-radius:50%;
  background:var(--navy);color:#fff;font-size:11px;font-weight:700;
  display:inline-flex;align-items:center;justify-content:center;
}
.wf-select{position:relative;display:block}
.wf-select::after{
  content:"";position:absolute;right:14px;top:50%;width:11px;height:11px;
  transform:translateY(-55%) rotate(45deg);
  border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);
  pointer-events:none;
}
.wf-select select{
  -webkit-appearance:none;-moz-appearance:none;appearance:none;
  width:100%;padding:13px 40px 13px 14px;
  font-size:15.5px;font-family:inherit;color:var(--ink);
  background:var(--bg);border:1.5px solid var(--line);border-radius:12px;
  cursor:pointer;transition:border-color .15s,box-shadow .15s;
}
.wf-select select:hover:not(:disabled){border-color:#c9cbd4}
.wf-select select:focus{outline:none;border-color:var(--navy);box-shadow:0 0 0 3px rgba(43,43,110,.12)}
.wf-select select:disabled{background:var(--soft);color:#aab;cursor:not-allowed}
/* result */
.wf-result{margin-top:18px;animation:rise .25s ease}
@keyframes rise{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.rc{
  border:1.5px solid var(--line);border-radius:var(--radius);
  background:var(--bg);box-shadow:var(--shadow);overflow:hidden;
}
.rc-top{padding:15px 16px;background:linear-gradient(180deg,#fafbfd,#f4f5f9);border-bottom:1px solid var(--line)}
.rc-veh{font-size:14px;font-weight:700;color:var(--navy)}
.rc-veh small{display:block;font-weight:500;color:var(--muted);font-size:12.5px;margin-top:2px}
.rc-body{padding:16px}
/* sizes */
.sizes{display:flex;gap:10px;margin-bottom:14px}
.size{
  flex:1;text-align:center;border:1.5px solid var(--line);border-radius:12px;
  padding:12px 8px;background:var(--soft);
}
.size b{display:block;font-size:26px;font-weight:800;color:var(--navy);line-height:1.1}
.size span{font-size:12px;color:var(--muted)}
.size em{display:block;font-style:normal;font-size:10.5px;color:var(--warn);margin-top:2px}
.size .unit{font-size:14px;font-weight:600}
.size.oos b{color:var(--warn)}
.size-note{font-size:12px;color:var(--warn);margin:-6px 0 14px;display:flex;gap:5px;align-items:flex-start}
/* product / cta */
.prod{border:1.5px solid var(--line);border-radius:12px;padding:12px 14px;display:flex;align-items:center;gap:12px;margin-bottom:12px}
.prod-info{flex:1;min-width:0}
.prod-name{font-size:13.5px;font-weight:700}
.prod-meta{font-size:12px;color:var(--muted);margin-top:2px}
.tag{display:inline-block;font-size:11px;font-weight:700;padding:2px 8px;border-radius:999px;vertical-align:middle;margin-left:6px}
.tag-combo{background:#eaf6ef;color:var(--ok)}
.tag-single{background:#eef0fa;color:var(--navy)}
.price{font-size:18px;font-weight:800;color:var(--ink);white-space:nowrap}
.price s{font-size:12px;color:var(--muted);font-weight:500;margin-right:4px}
.cta{
  display:flex;align-items:center;justify-content:center;gap:8px;
  width:100%;padding:14px;border-radius:12px;border:none;cursor:pointer;
  background:var(--navy);color:#fff;font-size:15.5px;font-weight:700;font-family:inherit;
  text-decoration:none;transition:background .15s,transform .05s;
}
.cta:hover{background:var(--navy-d)}
.cta:active{transform:translateY(1px)}
.cta svg{width:17px;height:17px;flex:0 0 auto}
.cta.secondary{background:#fff;color:var(--navy);border:1.5px solid var(--navy)}
.cta.secondary:hover{background:#f3f3fb}
.cta-row{display:flex;flex-direction:column;gap:9px}
.buy-hint{font-size:12.5px;color:var(--muted);text-align:center;margin-top:9px}
.buy-hint b{color:var(--ink)}
/* multi product-line options */
.opt-title{font-size:13px;font-weight:700;color:var(--ink);margin:2px 0 10px}
.opt-title span{font-weight:500;color:var(--muted);font-size:12px}
.opt{
  display:flex;align-items:center;gap:12px;text-decoration:none;color:inherit;
  border:1.5px solid var(--line);border-radius:12px;padding:13px 14px;margin-bottom:10px;
  transition:border-color .15s,box-shadow .15s,transform .05s;background:var(--bg);
}
.opt:hover{border-color:var(--navy);box-shadow:0 4px 14px rgba(43,43,110,.10)}
.opt:active{transform:translateY(1px)}
.opt-main{flex:1;min-width:0}
.opt-name{font-size:14px;font-weight:700;color:var(--ink);display:flex;align-items:center;flex-wrap:wrap;gap:6px}
.opt-sub{font-size:12px;color:var(--muted);margin-top:3px}
.opt-right{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.opt-price{font-size:18px;font-weight:800;color:var(--navy);white-space:nowrap;text-align:right;line-height:1.15}
.opt-price .was{display:block;font-size:11px;font-weight:500;color:var(--muted);text-decoration:line-through}
.opt-price .now{display:block;color:var(--sale)}
.opt-right svg{width:18px;height:18px;color:var(--navy)}
.tag-mat{background:#f0eee6;color:#7a6a3a}
.tag-promo{background:#fdecec;color:var(--sale)}
/* rear / info notes */
.note{
  display:flex;gap:8px;align-items:flex-start;font-size:12.5px;color:var(--muted);
  background:var(--soft);border-radius:10px;padding:10px 12px;margin-top:12px;
}
.note svg{width:15px;height:15px;flex:0 0 auto;margin-top:1px;opacity:.7}
/* dedicated / unavailable state */
.state{
  text-align:center;padding:22px 16px;
}
.state .ico{width:42px;height:42px;margin:0 auto 10px;opacity:.5}
.state h3{margin:0 0 6px;font-size:15px;color:var(--ink)}
.state p{margin:0;font-size:13px;color:var(--muted)}
.wf-foot{font-size:11.5px;color:#a0a3ab;text-align:center;margin:18px 0 0;line-height:1.6}
.wf-foot a{color:var(--muted)}
/* desktop */
@media(min-width:560px){
  .wf-steps{flex-direction:row}
  .wf-field{flex:1}
}